Hi Paddy,

Paddy Doyle <[log in to unmask]> writes:

> Hi Loris,
>
> On Tue, Mar 15, 2016 at 11:43:55AM +0100, Loris Bennett wrote:
>
>> Hi,
>> 
>> I'm using ansible to set up two servers and have run into the problem
>> that on one server 'hostname' returns the just the name of the machine,
>> but on the other I get the FQDN:
>> 
>> # hostname -s; hostname -d; hostname -f; hostname 
>> tadmin01
>> test.cluster
>> tadmin01.test.cluster
>> tadmin01
>> 
>> # hostname -s; hostname -d; hostname -f; hostname
>> tadmin02
>> test.cluster
>> tadmin02.test.cluster
>> tadmin02.test.cluster
>> 
>> The following files are identical on both servers
>> 
>> /etc/hosts
>> /etc/resolv.conf
>> 
>> The files
>> 
>> /etc/sysconfig/network
>> 
>> differs just in the following way:
>> 
>> < HOSTNAME=tadmin01
>> ---
>> > HOSTNAME=tadmin02
>> 
>> What other files could have an influence on what 'hostname' returns?
>
> Is caching an issue? E.g. with sssd or nscd? That gave us some trouble with
> ansible iirc.

I also suspected something might be being cached, but I have restarted
all the services I thought might play a role and the difference remains.

> We ended up using an explicit ansible rule to set the FQDN in
> /etc/sysconfig/network just to make sure that every node was consistent. And
> then if necessary use "hostname -s" or "hostname -f" as required.

The problem is that I am setting up DRDB with the following resource
definition:

resource r0 {
  net {
    protocol C;
    allow-two-primaries yes;
  }
  on tadmin01 {
    device   /dev/drbd0;
    disk     /dev/sda1;
    address  10.141.235.254:7789;
    meta-disk internal;
  }
  on tadmin02 {
    device   /dev/drbd0;
    disk     /dev/sda1;
    address  10.141.235.253:7789;
    meta-disk internal;
  }
}

However, when I do

  drbdadm create-md r0

I get the error

  'r0' not defined in your config (for this host).

From my googling my understanding is that the entry in the DRDB config
must match the result returned by 'hostname'.  I can obviously just
tweak the DRDB config to make it work, but I would really like to
understand why 'hostname' without any options gives me the FQDN in one
case and not in the other 

Cheers,

Loris

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